Only four points now separate the Blades and Boro after this 1-0 defeat to the Hatters, thanks to Carlton Morris’ goal early in the second half.
Overall, it was a poor display by Paul Heckingbottom’s side who looked as though they had given the visitors too much respect as the home side and struggled to really get going from the first minute.
Here’s how we rated the Sheffield United players after a miserable day at Bramall Lane
13. Tommy Doyle - 5
Added a little bit of a spark but United couldn't build any momentum and he struggled to make things happen as a result Photo: Isaac Parkin
14. James McAtee - 5
Either he or Doyle should really have been on earlier for Fleck rather than Sharp, or indeed starting the match as United needed to take the game to Luton. By the time he came on Luton were firmly controlling the play and McAtee couldn't make an impact Photo: Andrew Yates